Please use this identifier to cite or link to this item: doi:10.22028/D291-37961
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Title: Ni film decorated on Au-Ag alloy line to enhance graphene/cobalt hydroxide electrodes for micro-supercapacitors
Author(s): Zhang, Zhiqiang
Xia, Qiuyu
Chen, Yunkai
Pan, Xuexue
Pameté, Emmanuel
Zhang, Yong
Presser, Volker
Abbas, Qamar
Chen, Xinman
Language: English
Title: Electrochimica acta : the journal of the International Society of Electrochemistry
Volume: 433
Publisher/Platform: Elsevier
Year of Publication: 2022
Free key words: Micro-supercapacitors
Graphene/cobalt hydroxide/Ni electrode
Gel polymer electrolyte
Composite nanomaterial
Flexible electrodes
DDC notations: 540 Chemistry
621.3 Electrical engineering, electronics
Publikation type: Journal Article
Abstract: A nanocomposite of graphene, cobalt hydroxide and nickel can conveniently be synthesized on gold-silver alloy lines. Using a two-step electrodeposition method, the scaly morphology is pre-deposited on a Ni film, followed by the interconnecting corrugated graphene/cobalt hydroxide composite nanomaterial. Due to the pre-deposited Ni film, the area capacity of the graphene/cobalt hydroxide/Ni electrode is 1.6-times of the graphene/cobalt hydroxide electrode. The kinetic analysis of the graphene/cobalt hydroxide/Ni electrode displays diffusion and non-diffusion contributions of 38% and 62% at 10 mV s−1, respectively. X-ray photoelectron spectroscopy exhibits the oxidation of Co2+ to Co3+ dedicated to the OH- ion insertion. Furthermore, graphene/cobalt hydroxide/Ni//activated carbon flexible micro-supercapacitor (MSC) was assembled by gel KOH-PVA electrolyte, graphene/cobalt hydroxide/Ni (positive electrode), and activated carbon (negative electrode), which manifests maximum volumetric energy of 18.6 mWh cm−3. Moreover, MSC retains over 94% capacitance after 10,000 cycles. After 1,000 continuous bending/unbending cycles at a 180° bending angle with the frequency of 100 mHz, the capacitance retention of MSC is still maintained at 97% of the initial value. The results show outstanding flexibility and mechanical stability of MSC based on graphene/cobalt hydroxide/Ni electrode and confirm that further chemical and physical optimization may lead to the development of quasi-solid-state hybrid MSCs.
DOI of the first publication: 10.1016/j.electacta.2022.141247
URL of the first publication:
Link to this record: urn:nbn:de:bsz:291--ds-379616
ISSN: 0013-4686
Date of registration: 14-Nov-2022
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Volker Presser
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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